Earnings Per Share - Schedule of Basic And Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022
Numerator:
Net income	$ 208,800	$ 219,422	$ 224,914	$ 210,478	$ 428,222	$ 435,392
Denominator:
Basic weighted-average common shares outstanding	147,132		146,704		147,104	146,568
Effect of dilutive securities:
Stock options and restricted stock units	413		701		468	799
Diluted weighted average shares	147,545		147,405		147,572	147,367
Basic earnings per share (in dollars per share)	$ 1.42		$ 1.53		$ 2.91	$ 2.97
Diluted earnings per share (in dollars per share)	$ 1.42		$ 1.53		$ 2.90	$ 2.95